Magnetic properties of K-absorbing zeolite LTA

Abstract We report 29 Si-NMR and magnetic susceptibility measurements in K-absorbing zeolite LTA, K x /Na 12 y K 12(1− y ) –Si 12 Ai 12 O 48 where x =4.5 and 6, and y =0–1. It was confirmed that the ferromagnetic transition occurs in the bulk of K 4.5 /K 12 -Si 12 Ai 12 O 48 sample, and that the magnetic transition is very sensitive to Na content, y . It was also shown that the localized magnetic moments are confined to the cavities in the (–Si–O–Al–O–) zeolite framework.